Quantum Nondemolition Measurements and State Preparation in Quantum Gases by Light Detection

Igor B. Mekhov, Helmut Ritsch
2009 Physical Review Letters  
We consider light scattering from ultracold atoms trapped in an optical lattice into a cavity. The measurement of photons leaking out the cavity provides a quantum nondemolition (QND) access to various atomic variables. Depending on the chosen geometry the time resolved light detection projects the atomic quantum state to various atom-number squeezed and Schroedinger cat states. Modifications of the atomic and light properties at a single quantum trajectory are demonstrated. The quantum
more » ... e of final states can be revealed by further observations of the same sample.
doi:10.1103/physrevlett.102.020403 pmid:19257251 fatcat:cziunhtvwzbnxit7zbmonfmdkm